Fix WinXP Search Within Files of Unknown Type

I just had the lovely experience of searching for a string with in vhdl files in a directory on Windows XP only to have it report nothing matching when there were about a dozen files matching.

I fixed it with the following Microsoft support article:
http://support.microsoft.com/?kbid=309173

Only the last method worked for me:
"Network administrators can configure this setting by modifying the registry. To do this, set the FilterFilesWithUnknownExtensions DWORD value to 1 in the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ContentIndex"
Be careful in that registry!